Here is the list of currently banned domains:
41.234.217.68
66.232.244.223
66.232.245.130
66.232.252.136
66.232.253.2
66.232.254.49
66.232.254.49
66.232.255.22
ANY yahoo
aol.com
cox.net
hotmail.com
msn.com
yahoo.com